ISM gas studies towards the TeV PWN HESS J1825-137 and northern region

Abstract

HESS J1825-137 is a pulsar wind nebula (PWN) whose TeV emission extends across ~1 deg. Its large asymmetric shape indicates that its progenitor supernova interacted with a molecular cloud located in the north of the PWN as detected by previous CO Galactic survey (e.g Lemiere, Terrier & Djannati-Ataï 2006). Here we provide a detailed picture of the ISM towards the region north of HESS J1825-137, with the analysis of the dense molecular gas from our 7mm and 12mm Mopra survey and the more diffuse molecular gas from the Nanten CO(1-0) and GRS ${}^{13}$CO(1-0) surveys. Our focus is the possible association between HESS J1825-137 and the unidentified TeV source to the north, HESS J1826-130. We report several dense molecular regions whose kinematic distance matched the dispersion measured distance of the pulsar. Among them, the dense molecular gas located at (RA, Dec)=(18.421h,-13.282${}^{\circ }$) shows enhanced turbulence and we suggest that the velocity structure in this region may be explained by a cloud-cloud collision scenario. Furthermore, the presence of a H$\alpha$ rim may be the first evidence of the progenitor SNR of the pulsar PSR J1826-1334 as the distance between the H$\alpha$ rim and the TeV source matched with the predicted SNR radius R${}_{\text{SNR}}$~120 pc. From our ISM study, we identify a few plausible origins of the HESS J1826-130 emission, including the progenitor SNR of PSR J1826-1334 and the PWN G018.5-0.4 powered by PSR J1826-1256. A deeper TeV study however, is required to fully identify the origin of this mysterious TeV source.

19 figures, 27 pages, accepted by MNRAS

References in corpus (11)

• Precise Gamma-Ray Timing and Radio Observations of 17 Fermi Gamma-Ray Pulsars
• SiO line emission from C-type shock waves : interstellar jets and outflows
• Discovery of 35 New Supernova Remnants in the Inner Galaxy
• Resolution of the Distance Ambiguity for Galactic HII Regions
• Energy dependent gamma-ray morphology in the Pulsar wind nebula HESSJ1825-137
• Do cloud-cloud collisions trigger high-mass star formation? I. Small cloud collisions
• Gamma rays from molecular clouds
• Cloud-cloud collision as a trigger of the high-mass star formation; a molecular line study in RCW120
• Updated radio $\Sigma -D$ relation for Galactic supernova remnants
• Newly confirmed and high quality candidate Galactic SNRs uncovered from the AAO/UKST HAlpha survey
• Interpretation of radio continuum and molecular line observations of Sgr B2: free-free and synchrotron emission, and implications for cosmic rays

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• Evidence of 200 TeV photons from HAWC J1825-134
• RCW 36 in the Vela Molecular Ridge: Evidence for a high-mass star cluster formation triggered by Cloud-Cloud Collision
• The Mopra Southern Galactic Plane CO Survey - Data Release 3
• A Catalogue of Galactic Supernova Remnants in the far-infrared: revealing ejecta dust in pulsar wind nebulae
• Evidence that Ultra-High-Energy Gamma Rays are a Universal Feature Near Powerful Pulsars
• Ultra-high energy Inverse Compton emission from Galactic electron accelerators
• A Complete Catalogue of Dusty Supernova Remnants
• On the anomalously large extension of the Pulsar Wind Nebula HESS J1825-137
• On the Unusually Large Spatial Extent of the TeV nebula HESS J1825-137: Implication from the Energy-Dependent Morphology
• Using Interstellar Clouds to Search for Galactic PeVatrons: Gamma-ray Signatures from Supernova Remnants
• A new study towards PSR J1826-1334 and PSR J1826-1256 in the region of HESS J1825-137 and HESS J1826-130
• Dense molecular gas at 12 mm towards Galactic TeV gamma-ray sources
• An extreme particle accelerator in the Galactic plane: HESS J1826$-$130
• Atlas of CO-Line Shells and Cavities around Galactic Supernova Remnants with FUGIN
• Connecting the ISM to TeV PWNe and PWNe candidates
• A study of the interstellar medium towards the unidentified dark TeV $\gamma$-ray sources HESS J1614-518 and HESS J1616-508
• A 3D Diffusive and Advective Model of Electron Transport Applied to the Pulsar Wind Nebula HESS J1825-137
• Revealing a new region of gamma-ray emission in the vicinity of HESS J1825-137
• HESS J1826$-$130: A Very Hard $\gamma$-Ray Spectrum Source in the Galactic Plane
• Explaining the extended GeV gamma-ray emission adjacent to HESS J1825-137
• The Eel Pulsar Wind Nebula: a PeVatron-Candidate Origin for HAWC J1826-128 and HESS J1826-130
• The Potential for Hadronic Particle Acceleration in Galactic Pulsar Wind Nebulae